a close-fitting covering for the head, usually of soft supple material and having no visor or brim.

a brimless head covering with a visor, as a baseball cap.

mobcap.

a headdress denoting rank, occupation, religious order, or the like

a nurse's cap.

mortarboard ( def. 2 ) .

Mathematics . the symbol ?, used to indicate the intersection of two sets. Compare intersection ( def. 3a ) .

anything resembling or suggestive of a covering for the head in shape, use, or position

a cap on a bottle.

summit; top; acme.

a maximum limit, as one set by law or agreement on prices, wages, spending, etc., during a certain period of time; ceiling

a 9 percent cap on pay increases for this year.

Mycology . the pileus of a mushroom.

Botany . calyptra ( def. 1 ) .

Mining . a short, horizontal beam at the top of a prop for supporting part of a roof.

a percussion cap.

British Sports . a selection for a representative team, usually for a national squad.

a noise-making device for toy pistols, made of a small quantity of explosive wrapped in paper or other thin material.

Nautical . a fitting of metal placed over the head of a spar, as a mast or bowsprit, and having a collar for securing an additional spar.

a new tread applied to a worn pneumatic tire.

Architecture . a capital.

Carpentry . a metal plate placed over the iron of a plane to break the shavings as they rise.

Fox Hunting . capping fee.

Chiefly British Slang . a contraceptive diaphragm.

to provide or cover with or as if with a cap.

to complete.

follow up with something as good or better; surpass; outdo

to cap one joke with another.

to serve as a cap, covering, or top to; overlie.

to put a maximum limit on (prices, wages, spending, etc.).

British Sports . to select (a player) for a representative team.

Fox Hunting . to hunt with a hunting club of which one is not a member, on payment of a capping fee. ?

cap in hand

humbly; in supplication

He went to his father cap in hand and begged his forgiveness.

set one's cap for

to pursue as being a potential mate.

noun

beanie , beret , bonnet , dink , fez , pillbox , skullcap , tam , tam o’shanter , apex , crest , crown , peak , roof , summit , top , vertex

verb

beat , best , better , button down , button up , can * , clinch * , cob , complete , cover , crest , crown , do to a t , eclipse , exceed , excel , finish , outshine , outstrip , pass , put the lid on , surmount , surpass , top , top it off , transcend , trump , wrap up * , top off , blanket , overlay , spread , culminate , peak , arrest , beanie , beret , bonnet , climax , coif , consummate , cork , cornet , detonator , dome , fez , hat , headgear , headpiece , helmet , hood , kepi , lid , montero , mortarboard , outdo , seal , seize , summit , taj , tip , topee , turban , yarmulke